OpenShift is great to run your small website or application in the cloud. The main advantage is, it gives free 3 small gears. It can easily handle your personal or small amount of traffic. But it gets into idle mode when not used for 24 hours. So if there isn't any HTTP request in 24 hours, your application will be in idle mode. And next time, when it receives the request it will take a little bit longer to respond as it needs to start your gear and then responds to the request.